One pot stereoselective synthesis of chiral α,ω-diynes from bromoallenes and organobis(heterocuprates)
作者:Anna Maria Caporusso、Laura Antonella Aronica、Roberto Geri、Marco Gori
DOI:10.1016/s0022-328x(01)01438-3
日期:2002.4
di-Grignard reagents, obtained from 1,4-dibromobutane and 1,4-dibromobenzene, respectively, with CuSPh and LiCuBr2. The cross-coupling reaction of these di-cuprate reagents with 3-alkyl and 3,3-dialkyl 1-bromo-1,2-dienes (1) provides a general method for selective synthesis of 1,9-decadiynes (5) and 1,4-bis(2-propynyl)benzenes (6), characterized by two identical chiral centres in the α position to the triple
Organobis(heterocuprates),7和8,已在原位1,4-二锂丁烷和二-格氏试剂,分别从1,4-二溴丁烷和1,4-二溴苯,获得,与CuSPh和LiCuBr制备反应2。与3-烷基和3,3-二烷基-1-溴-1,2-二烯这些二-铜酸盐试剂的交叉偶联反应(1)为1,9- decadiynes(选择合成的一般方法5)和1,4-双(2-丙炔基)苯(6),在α位置到三键,其特征在于两个相同的手性中心。高1,3-抗连接过程的立体选择性允许我们获得对映体富集的α,ω-二炔5和图6从旋光的艾伦衬底1开始。